Biarritz —  Iran's foreign minister flew into the French resort hosting a G7 summit on Sunday for  brief talks with French host Emmanuel Macron, in an unexpected twist to a meeting already troubled by differences between US President Donald Trump and western allies over a raft of issues, including Iran.

Mohammad Javad Zarif was there to assess what conditions could lead to a de-escalation of tension between Tehran and Washington, a French official said.

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